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Goodwill (Tables)
6 Months Ended
Jun. 30, 2012
Goodwill By Reportable Operating Segment
Goodwill             
 The following tables show goodwill by reportable operating segment for Duke Energy and Duke Energy Ohio:
              
Duke Energy            
(in millions) USFE&G Commercial Power International Energy Total
Balance at December 31, 2011:            
Goodwill $ 3,483 $ 940 $ 297 $ 4,720
Accumulated Impairment Charges     (871)     (871)
Balance at December 31, 2011, as adjusted for accumulated impairment charges   3,483   69   297   3,849
Balance at June 30, 2012:            
Goodwill   3,483   940   297   4,720
Accumulated Impairment Charges     (871)     (871)
Foreign Exchange and Other Changes       (7)   (7)
Balance at June 30, 2012, as adjusted for accumulated impairment charges $ 3,483 $ 69 $ 290 $ 3,842
Duke Energy Ohio [Member]
 
Goodwill By Reportable Operating Segment
Duke Energy Ohio         
(in millions) Franchised Electric & Gas Commercial Power Total
Balance at December 31, 2011:         
Goodwill $ 1,137 $ 1,188 $ 2,325
Accumulated Impairment Charges   (216)   (1,188)   (1,404)
Balance at December 31, 2011, as adjusted for accumulated impairment charges   921     921
Balance at June 30, 2012:         
Goodwill   1,137   1,188   2,325
Accumulated Impairment Charges   (216)   (1,188)   (1,404)
Balance at June 30, 2012, as adjusted for accumulated impairment charges $ 921 $ $ 921